To train machine learning models we need to provide the model with a training and testing set. And sometimes even a validation set. These terms tend to be used interchangeably causing confusion. So once and for all, let's learn what each of these data splits do and how they contribute to model development.
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Wesley C. is a cartographer and Geographic Information System (GIS) Analyst for the San Francisco Department of Public Health. He uses GIS technology to gather and organize information in order to improve pedestrian infrastructure. As part of ConnectEd's "Day in the Life" series, Wesley discusses his daily duties and the knowledge needed to be a Cartographer and GIS Analyst.
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The "impossible arrow" illusion by Prof. Kokichi Sugihara seems to break the laws of physics. The arrow always seems to point in one direction when you try to rotate it, but its reflection in a mirror points the other way! Learn about the illusion, how it works, and how to make your own 3D printed impossible arrow at Science Buddies: https://www.sciencebuddies.org/stem-activities/impossible-arrow-illusion?ytid=PKnPN3IzILQ&ytsrc=description See the full-length video here:…
The 2014 Hart Vision Teacher of the Year was given to Brittany Barnes of Math and Science College Preparatory Academy in Los Angeles. She is recognized as one of the leading math teachers in California.
K-means clustering is used in all kinds of situations and it's crazy simple. The R code is on the StatQuest GitHub: https://github.com/StatQuest/k_means_clustering_demo/blob/master/k_means_clustering_demo.R
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The main ideas behind PCA are actually super simple and that means it's easy to interpret a PCA plot: Samples that are correlated will cluster together apart from samples that are not correlated with them. In this video, I walk through the ideas so that you will have an intuitive sense of how PCA plots are draw. If you'd like more details, check out my full length PCA video here: https://youtu.be/_UVHneBUBW0
For a complete index of all the StatQuest videos, check…
In this tutorial, we’re going to show you how create an Excel 2016 Chart with Two Y Axes.
Once you have a chart and two sets of data plotted, left-click directly onto the line, columns, etc. of the set of data you want on the secondary axis. After selecting it, right-click it and choose Format Data Series.
Choose Secondary Axis instead of Primary Axis.
Optionally, to make things more visually appealing and differentiating the two axes, left-click one of them to select it. Under the Format…
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